The park and surrounding area is named for the artillery batteries that were built in the late 17th century to protect the settlement behind them. By the 1820s, the Battery had become an entertainment destination, with the conversion of Castle Clinton into a theater venue. During the mid-19th century, the modern-day Battery Park was constructed and Castle Clinton was converted into an immigration and customs center. The Battery was commonly known as the landing point for immigrants to New York City until 1892, when the immigration center was relocated to Ellis Island. Castle Clinton then hosted the New York Aquarium from 1896 to 1941.
By the 20th century, the quality of Battery Park had started to decline, and several new structures were proposed within the park, many of which were not built. In 1940, the entirety of Battery Park was closed for twelve years due to the construction of the Brooklyn–Battery Tunnel and the Battery Park Underpass. The park reopened in 1952 after a renovation, but then subsequently went into decline. The Battery Conservancy, founded in 1994 by Warrie Price, underwrote and funded the restoration and improvement of the once-dilapidated park. In 2015, the Conservancy restored the park’s historical name, “the Battery”.
In late 2005, New York City authorities announced that builders working on the new station had found the remains of a stone wall from the British colonial era, during the late 17th or 18th century. After archeological analysis, the wall was widely reported to be the oldest man-made structure still in place in Manhattan. Four walls and over 250,000 individual artifacts were found, and a portion of one wall was placed on temporary display inside Castle Clinton. Another, long portion of the wall was embedded permanently into the entrance to the newly constructed station, at the same depth below street level as originally discovered. Robert Tierney, chairman of the New York City Landmarks Preservation Commission, said that the wall was probably built to protect the park’s original artillery batteries. The remains were described as “an important remnant of the history of New York City”.
